Light

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Across
  1. 3. A lens thinner in the middle
  2. 6. Bending of light
  3. 8. Medium having lowest Refractive Index
  4. 9. Mirror of magnification +1
  5. 10. Measured in Dioptre
Down
  1. 1. Parallel rays gather at it
  2. 2. Has Refractive Index of ~1.33
  3. 4. Security mirror
  4. 5. Densest optical medium
  5. 7. Obtained on screen